[web2py] Web2py won't connect to MSSQL

[CJM]

I'm unable to get web2py to connect to mssql.

<type 'exceptions.RuntimeError'>(Failure to connect, tried 5 times:
'NoneType' object has no attribute 'connect')

My connection string is: db = DAL('mssql://
testUser:password1@localhost/testDB')

Environment
  Windows Server 2008 R2, 64-bit operating system
  SQL Server 2008 R2, local.
  Web2py: source code install version 1.99.2 (2011-09-26 06:55:33)
stable.
  pyodbc
  Python 2.7.2

I've tested that I can connect using the pyodbc. The following code
works:

import pyodbc
cnxn = pyodbc.connect('DRIVER={SQL
Server};SERVER=localhost;DATABASE=testDB;UID=testUser;PWD=password1')
cursor = cnxn.cursor()
cursor.execute("select * from tbUsers")
rows = cursor.fetchall()
for row in rows:
  print row

Thanks for your time.

Corey.